Process of applying abrasive



Jan. 2, 1934.- s. GREGORY ET AL PROCESS OF APPLYING ABRASIVE Filed Oct. 13, 1930 2 Sheets-Sheet 1 Jan. 2, 1934. s. GREGORY ET AL 1,941,795

PROCESS OF APPLYING ABRASIVE Filed Oct. 13, 1930 2 Sheets-Sheet 2 1 Q2521 //L ./.z :7: 6 096g? Gre o y.

Patented Jan. 2, 1934 UNITED STATES PATENT OFFICE PROCESS OF APPLYING ABRASIVE Application October 13,

7 Claims.

This invention has-to do with a process of setting up or applying abrasive to polishing belts or the like.

The employment of belts coated with abrasive for use in polishing work that has been ground, is highly desirable wherever a smooth surface is desired, especially on metals which are to be plated. Employment of polishing belts for this purpose has heretofore been very expensive, and for that reason has not been as extensive as would otherwise be true. Thedifiiculty heretofore existing of applying a new coat of abrasive when the original has worn off has been so great that the cost has been prohibitive. Attempts thus far made to apply an abrasive to polishing belts after the original abrasive surface has worn off have met with little success for the reason that it has been difiicult to properly mount and support the belts during the process, with the resultsnot only of a substantial loss of time, but

that the abrasive coating was not uniformly applied to the outer surface of the belt and was not well embedded in the glue on the belt, so that it would wear off in an exceedingly short time, and the polishing job would be poor.

An object of the invention consists in a process for efliciently applying an abrasive to a polishing belt, or the like.

In the practice of the invention, the belt to which abrasive is to be applied in accordance with the present invention is placed about a suitable fixture and stretched taut in embracing relation thereto. The part of the fixture contiguous to the belt is preferably-resilient to afford a cushion support for the belt. The outer surface of the belt is then coated with a suitable adhesive such as glue and thereafter the fixture is moved in such a manner as to intermittently pound the coated side of the belt into a bed of powdered abrasive. The successive portions so pounded maybe contiguous if desired but that is not necessary. The fixture may be so moved as to cause the same to roll in theabrasive, as the belt is mounted so that when the belt next contacts the abrasive a different part of the belt is presented to the abrasive. Suitable mechanism may be employed-for reciprocating or oscillating the fixture. The grains of abrasive applied thus to the belt are so embedded that a major portion of each grain is substantially covered or enclosed by the glue and adheres tenaciously to the belt.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompanying drawings.

This invention (in a preferred form) is illus- 1930. Serial No'. 488,332

(Cl. Sil -68) trated in the drawings and hereinafter more fully described. I

On the drawings:

Figure 1 illustrates a polishing belt mounted foruse in a polishing machine.

Figure 2 is an elevational view of a setting up fixture or chuck for a polishing belt with the belt mounted thereon ready for application in connection with an abrasive applying device.

Figure 3 is a sectional view partly'in elevation, 5' enlarged and taken substantially in the plane in dicated by the line III-III in Figure 2.

Figure 4 is a view similar to Figure 2, but showing the belt tightly mounted on the chuck and ready to receive an abrasive coating. 7

Figure 5 is a sectional view considerably enlarged and taken approximately in the plane indicated by the lines V--V in Figure 4.

Referring now more particularly to the drawings, wherein identical parts are indicated by the same reference characters, we indicate at A,

a pair of pulleys adapted norznallyto receive a polishing belt B for use in connection with any type of polishing machine employingsuch a belt.

A fixture or chuck which maybe employed in practicing our inventionis indicated generally at 1 and includes spaced discs 2 of wood, metal, or the like, having annular flanges 3 facing each other and a substantial distance apart. Each flange 3 is spaced inwardly of the outer periphcry 4 of its disc'and is surrounded by a preferably inclined surface 5.

Disposed between the surfaces 5 and seated thereagainst is a resilient ring 6 whose inner pe- V riphery '7 engages flanges 3, the latter thereby precluding reduction of the inner diameter of the ring 6. While any suitable means may be employed for drawing the discs toward each other, in order to compress the resilientring 6 to there- I by expand the same radially, we prefer to provide the discs 2 with axial openings '8 and loosely pass through said openings the shank 9 of a hollow bolt 9a whose head 10 engages the outer surface of one of the disc's-2. A nut 12 is applied to the threaded portion of the shank 9 projecting beyond the other disc 2, and said nut is adapted to engage said other disc and be tightenedon the-shank 9.

In Figures 2 and 3, the belt B is shown as it would appear applied to the setting up device before expansion of the resilient ring 6, and it is apparent that a space such as indicated at 13 would appear between the outer periphery 14 of the ring 6 and the inner periphery 15 of the belt B. When the nut 12 is sufficiently tightened up to occupy the position shown in Figure latter in place on the setting up fixture or chuck 1 while the abrasive is applied to the belt. It will be apparent that this operation is exceedingly simple, and the parts constituting the setting up devices are likewise simple.

While the construction may be modified in numerous ways in order to use any desired variation of our method of applying abrasive to the belt B, we preferably provide a hollow bolt 9a,

employing the opening 16 thereof for the reception of an arbor which is adapted to extend beyond the ends of the bolt, the extending ends being receivable in the bearings of a wheel set-up machine, as disclosed in the pending application for patent filed by Owen Doutt on Feb. 14, 1930, Serial No. 428,309, entitled Abrasive applying machine. Glue or like adhesive is first applied to the surface of the belt, and by subjecting the belt B, securely mounted on the device 1, to a pounding action against the powdered abrasive as disclosed in said pending application, the belt B will be supplied with a uniform coating of abrasive which is embedded in the glue or other adhesive very thoroughly. 7

The construction and operation of the subject matter of said pending application is briefly as follows: a rocker arm, actuated by suitable driving means, has at its free end means for rotatably receiving an arbor or axle on which a glue-coated grinding wheel or the like is mounted. Below the free end of the rocker, a mass of abrasive material is provided. The rocker is supported upon a movable pivot, so that when the rocker is actuated, the wheel supported thereby is given a rotary movement. The abrasive material is so positioned that upon each downward movement of the wheel, the latter pounds into the abrasive. The wheel is loosely mounted for rotation relative to the free end of the rocker, and as the wheel pounds into the abrasive material, the wheel has imparted to it a rolling motion, so that, upon the next succeeding downward movement of the wheel, a new surface adjacent or contiguous to the portion previously presented is en gagedby the abrasive material. In this way, the abrasive material is pounded uniformly at regular intervals with uniform pressure through the periphery of the wheel and is embedded in the glue or like adhesive so thatthe major portion of the surface of each grain of abrasive material is covered or enclosed by the glue.

It will be appreciated that, if desired, the lead 10 of the bolt 9a may be eliminated and the bolt made integral with one of the discs. Moreover, while we provide resilient rings 6 which maybe of rubber, any other radially expansible instrumentalities, whet-her of rubber or resiliently mounted metallic means or the like may be used.

After the belt B has received its abrasive coating as set forth, the device 1 is removed from the abrasive applying machine and put in a place where it is permitted to dry, after which the nut 12 is backed off the shank 9 until suflicient play is provided between the belt and the outer periphgr lrtof the ring 6 to permit ready removal of the It will be seen from the above that the method involved herein in the application of a thorough and uniform coating of abrasive to a polishing belt is simple and greatly advantageous over methods heretofore in vogue.

We are aware that numerous details of the process herein set forth may be varied through a wide range without departing from the principles of this invention, and we, therefore, do not purpose limiting the patent granted, otherwise than necessitated by the prior art.

We claim as our invention:

1. The method of producing a polishing belt, which comprises the steps of temporarily applying an untreated belt to a cushioning means so that the latter is in intimate contact with the belt throughout the length of the latter, coating the periphery of the belt with a sticky substance, and pounding at regular intervals contiguous portions of the periphery thus coated into a mass of abrasive material. i' I r 2. The method of applying abrasive to abelt for polishing and like purposeawhich comprises the steps of temporarily applying the belt to a yieldable fixture, with. the latter in intimate contact with substantiallythe entire inner periphery of the belt to cushion the same, coating the outer periphery of the belt with a sticky substance, and pounding successively different portions of the periphery thus coated into a mass of abrasive.

3. The method of applying abrasive to a belt to be used in polishing, comprising the steps of temporarily securing the untreated belt; to a resilient support providing a cushioning means for the entire length of the belt, coatingthe outer periphery of the belt with a sticky substance, and rolling and pounding successively contiguous portions of the periphery thus coated into a mass of abrasive material. 2

4. A process of applying a coat of powdered abrasive to a strap-like member, which comprises coating the same with adhesive, and poundingthe abrasive into the adhesive.

5. A process of applying a coat of powdered abrasive to a strap-like member, which-comprises holding the member taut, coating the samewith adhesive, and pounding the abrasive into the adhesive.

6. A process of applying a coat of powdered abrasive to a strap-like member, which comprises coating the same with adhesive, and resiliently.

pounding the abrasive into the adhesive.v 7. A process of applyinga coat if powdered abrasive to a'strap-like member, which comprises holding the membertaut, coating the same with,

adhesive, and resiliently pounding the abrasive into the adhesive. 1

SYDNEY GREGORY. REUBEN ROBERT 

